#define _CRT_SECURE_NO_WARNINGS 1
#include<bits/stdc++.h>
using namespace std;
#define ll long long
const int N = 2e5 + 10;
ll a[N], prefix[N];

int main() {
    ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    int t; cin >> t;
    while (t--) {
        int n, k; cin >> n >> k;
        for (int i = 1; i <= n; i++) cin >> a[i];
        sort(a + 1, a + n + 1);
        for (int i = 1; i <= n; i++) {
            prefix[i] = prefix[i - 1] + a[i];
        }
        ll ans = 0;
        for (int i = 0; i <= k; i++) {
            ll maxCnt = i, minCnt = 2 * (k - i); 
            ll now = prefix[n - maxCnt] - prefix[minCnt];
            ans = max(ans, now);
        }
        cout << ans << '\n';
    }
    return 0;
}